Nice work
You certainly keep the original feel of the Tetris theme, which can be difficult when remixing something. Kudos there!
The drums and cymbal seem a little over the top in places. I think that hi-hat hits are too rapid, and the drums are random. My main suggestion is to go and redo sections of the drums to make them solidify the foundation of the piece.
Have you considered lengthening it out a bit and introducing a new instrument? It's something to think about, as it would not only add a layer of complexity, but would let you add some more of your own ideas into the mix.
Keep up the good work!